// DEPRECATED CONSTRUCTOR SecondDerivativeImplicitEuler::SecondDerivativeImplicitEuler(const std::string & deprecated_name, InputParameters parameters) : TimeKernel(deprecated_name, parameters), _u_old(valueOld()), _u_older(valueOlder()) {}
SecondDerivative::SecondDerivative(const std::string & name, InputParameters parameters) : TimeKernel(name, parameters), _u_old(valueOld()), _u_older(valueOlder()) {}
SecondDerivativeImplicitEuler::SecondDerivativeImplicitEuler(const InputParameters & parameters) : TimeKernel(parameters), _u_old(valueOld()), _u_older(valueOlder()) {}